/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

(function () {
  function displaySearchResults(results, store) {
    var searchResults = document.getElementById('search-results');

    if (results.length) { // Are there any results?
      var appendString = '';

      for (var i = 0; i < results.length; i++) {  // Iterate over the results
        var item = store[results[i].ref];
        appendString += '<p><a href="' + item.url + '"><h3>' + item.title + '</h3></a>';
        appendString += '<p>' + item.content.substring(0, 150) + '...</p></p>';
      }

      searchResults.innerHTML = appendString;
    } else {
      searchResults.innerHTML = '<p>No results found</p>';
    }
  }

  function getQueryVariable(variable) {
    var query = window.location.search.substring(1);
    var vars = query.split('&');

    for (var i = 0; i < vars.length; i++) {
      var pair = vars[i].split('=');

      if (pair[0] === variable) {
        return decodeURIComponent(pair[1].replace(/\+/g, '%20'));
      }
    }
  }

  var searchTerm = getQueryVariable('query');

  if (searchTerm) {
    document.getElementById('search-box').setAttribute("value", searchTerm);

    // Initalize lunr with the fields it will be searching on. I've given title
    // a boost of 10 to indicate matches on this field are more important.
    var idx = lunr(function () {
      this.field('id');
      this.field('title', { boost: 10 });
      this.field('author');
      this.field('category');
      this.field('content');

      for (var key in window.store) { // Add the data to lunr
        this.add({
          'id': key,
          'title': window.store[key].title,
          'author': window.store[key].author,
          'category': window.store[key].category,
          'content': window.store[key].content
        });

      }
    });

    var results = idx.search(searchTerm); // Get lunr to perform a search
    displaySearchResults(results, window.store); // We'll write this in the next section

  }
})();